Understanding Pressure Ulcers
Pressure ulcers, commonly called bedsores, develop when sustained pressure—especially over bony areas—damages skin and underlying tissue. Unlike acute wounds, these injuries typically emerge gradually in immobilized patients, with multiple contributing factors accelerating their formation.
Key risk factors include:
- Prolonged immobility or bed rest
- Advanced age (70+ years)
- Inadequate nutrition or protein intake
- Incontinence and skin moisture
- Diabetes and circulatory disease
- Cognitive impairment limiting repositioning
- Previous pressure ulcer history
The financial burden is substantial: treating a single severe ulcer can cost thousands of dollars, making prevention far more cost-effective than management after ulcer formation.
The Braden Scale Framework
Developed in 1987, the Braden scale emerged from clinical research to standardize pressure ulcer risk assessment across diverse care environments. It addresses six distinct physiological and functional domains that independently contribute to ulcer development.
The scale works by scoring each category separately, then combining them into a single risk indicator. Unlike generic checklists, the Braden approach forces clinicians to evaluate specific modifiable factors—such as nutritional support or repositioning frequency—that can be targeted in care planning.
Each of the first five subscales (sensory perception, moisture, activity, mobility, nutrition) is scored 1–4 points, while friction/shear is scored 1–3 points. A higher total score reflects lower risk, with a maximum of 23 points representing minimal pressure ulcer danger.
Braden Score Calculation
The Braden score is the direct sum of six component scores. Each component reflects a different aspect of wound risk and is evaluated independently during clinical assessment.
Braden Score = Sensory Perception + Moisture + Activity +
Mobility + Nutrition + Friction/Shear
Sensory Perception— Ability to respond to pressure-related discomfort (scored 1–4)Moisture— Degree of skin exposure to moisture from incontinence or perspiration (scored 1–4)Activity— Extent of physical activity and time spent walking or sitting (scored 1–4)Mobility— Ability to change position independently (scored 1–4)Nutrition— Usual food intake and protein consumption patterns (scored 1–4)Friction/Shear— Risk of skin trauma from sliding or friction forces (scored 1–3)
Risk Stratification and Clinical Interpretation
Braden score results fall into established risk categories that guide clinical decision-making:
- 15–23 points: Minimal risk—standard preventive measures sufficient
- 13–14 points: Mild risk—implement routine repositioning and skin care
- 10–12 points: Moderate risk—initiate pressure-relief devices and frequent assessments
- ≤9 points: High/very high risk—aggressive interventions including specialized mattresses, hourly repositioning, and intensive skin monitoring
Scores should be recalculated whenever clinical status changes significantly—such as after acute illness, surgery, or substantial decline in mobility or nutrition. Serial assessments are more predictive than a single baseline score.
Practical Considerations When Using the Braden Scale
Accurate scoring depends on careful patient assessment and understanding each subscale's nuances.
- Distinguish between absolute and relative immobility — A patient confined to bed scores lower than one who walks with assistance. Clear the distinction: can the patient reposition themselves independently without staff help? Sedation, dementia, or spinal injury dramatically lower mobility scores regardless of physical capacity.
- Account for incontinence timing and type — Moisture from urine, stool, or wound drainage all increase ulcer risk by macerating skin. However, brief, contained moisture differs from continuous dampness. If incontinence occurs once daily versus constantly, choose the category reflecting current moisture exposure, not worst-case scenarios.
- Evaluate nutrition holistically, not by weight alone — A patient with recent unintentional weight loss, poor oral intake, or inadequate protein despite normal BMI scores lower on nutrition. Conversely, obesity without adequate protein does not protect against pressure ulcers. Review recent intake, albumin levels, and swallow function.
- Reassess after interventions and clinical changes — The Braden score is a snapshot, not a permanent label. If nutrition improves, mobility increases, or incontinence is better managed, scores will rise and risk may decrease. Frequent reassessment—especially in acute hospital settings—ensures care remains appropriate to current risk.